Screen-plate fastener.



M. J. MOLLBN. SCREEN PLATE FASTENBR.

APPLICATION FILED MAY 8, 1909.

Patented Apr. 12,1910.

UNITED STATES PATEN T OFFICE.

MARTIN J. MOLLEN, OF NEKOOSA, WISCONSIN.

SCREEN-PLATE FASTENER.

To all whom it may concern:

Be it known that I, IVIARTIN J. MoLLnN, a citizen of the United States,residing at Nekoosa, in the county of \Vood and State of Wisconsin, haveinvented a new and useful Screen-Plate Fastener, of which the followingis a specification.

This invention relates to improvements in paper pulp screens and has forits object the provision of a screen box of a simple and strongconstruction which will be free of leakage.

The further object of the invention is to provide an improved fasteningdevice by which the screenplates may be quickly and firmly secured inplace and may be readily removed when it is desired to clean the screen.

These objects are attained in the device illustrated in the accompanyingdrawings, and the invention resides in certain novel features of thesame as will be hereinafter first fully described and then particularlypointed out in the appended claims.

In the annexed drawings, which fully illustrate the invention, Figure 1is a plan view partly broken away of a paper pulp screen embodying thennprovements. Fig.

2 is a longitudinal section on the line 2-2 of Fig. 1. Fig. 3 is atransverse section on the line of Fig. 1. Fig. 1: is a detailperspective view of a portion of the fastening devices.

In carrying out my invention, I employ a box frame 1 of the usualconstruction and to the sides and ends of said frame I secure thechannel irons 2. Upon the upper edges of the end bars 2 I secureretaining strips 3 having their inner edges beveled so as to formslightly over-hanging lips as indicated clearly in Fig. 2. Atintermediate points of the length of the box 1, I secure transverseI-beams 4, having dove-tailed strips 5 on their upper edges, the saidstrips being so shaped as to present slightly over-hanging lips, asclearly shown in Fig. 2. txtending between the sides of the box 1 andarranged at points between the I-beams 4L and the ends of the box andbetween adjacent I-beams, I secure to the side bars 2, by means of angleirons 6, the transverse channel irons 7 which are spaced apartsu'tliciently to admit the screen-locking strip. 8. These channel irons7 are constructed with longitudinal slots 9 near one end and near thecenter through which transverse bolts 10 are Specification of LettersPatent.

Application filed May 8, 1909.

Patented Apr. 12. 1910.

Serial No. 494.775.

inserted, the outer ends of the said bolts be ing inserted throughstrips 11. which serve to cover the said slots 9 and thereby preventaccumulation of matter therein, and also serve as connecting linkstosecure a simultaneous longitudinal movement of the said bolts in theoperation of the device. The outer-most bolt 10 is caused to passthrough the eye 12 of an eye-bolt 13 which projects from the said bolt10 through the side chain nel iron 2 and the side of the box 1 and isfitted in an internally threaded sleeve or nut 14.- having an annulargroove 15 near its outer end as shown most clearly in Fig. 1. Thissleeve or nut 14 is rotatably mounted in a journal plate 16 which isrigidly secured to the side of the screen box and is provided with asuitable opening to receive the said nut or sleeve 141 and to the outerface of this plate 16 I secure a keeper or locking plate 17, having asemi-circular recess in its lower edge, the wall of the said recessbeing arranged to enter the groove 15 in the nut or sleeve, therebyholding the said nut or sleeve against longitudinal movement, but at thesame time permitting a rotary movement of the same.

The fastening strip 8 has its upper head dove-tailed, and dependingcentrally from the said head is a central web 18, which is adapted tofit between the channel irons 7, and is formed with strengthening ribs,18, as shown in Fig. 2. This depending rib or web 18 is so shaped as topresent a central enlargement 15), provided with an inclined notch oropen-ended slot 20. This inclined slot or open-ended notch 20 is adaptedto engage the innermost transverse bolt 10 in the operation of fasteningthe screen plates in position.

The screen plates, 21., may be of the usual or any preferredconstruction, and are supported upon the upper edges or flanges of theseveral channel irons, with their edges engaging the dovetailed stripson the same, while between the adjacent edges of the bars of a pair ofscreen plates the fastening strip 8 is inserted so that when the saidplate is drawn home the screen plates will be firmly held in place.

In assembling the parts in accordance with my invention, the severalchannel irons are secured to the sides of the wooden screen box in anyconvenient manner. The screen plates are placed upon the I-beams 4: andthe channel irons 7 with their edges engaging the dove-tailed heads 5 ofthe I-beams, as will be readily understood. The retaining bar 8 is theninserted downward between the channel irons 7, it being understood, ofcourse, that at this time the transverse bolts 10 are at the inner endsof the longitudinal slots 9. The upper inclined wall of the notch 20will then rest upon the innermost bolt 10. The eye-bolt 13 is, ofcourse, fitted upon the outer bolt 10 when the said bolt is insertedthrough the channel irons 7 and the end of said eye bolt is projectedthrough the side of the screen box. The bearing plate 16 is secured tothe side of the box with the bolt. 13 passing centrally through itsopening and the nut or sleeve 14 is then fitted on the said plate andturned home so as to be journaled in the plate 16. The locking plate 17is then secured to the plate 16 with its lower concave edge fitting inthe groove 15 of the nut or sleeve so as to swivel the said nut. lViththe parts thus arranged, if a wrench or similar tool be applied to theouter end of the nut orsleeve let and the said nut turned to the right,the bolts 10 will be drawn horizontally to the outer ends of the slots 9and this action will cause the inner transverse bolt 10 to ride upon thelower face of the notch or open-ended slot 20 so as to force the samedownward, the result being that the fastening bar 8 is drawn verticallydownward so that the dove-tailed head of the same will engage the edgesof a pair of screen plates and will firmly clamp the same upon the uppersides of the channel irons 7. It will be seen that the movement impartedto this fastening member will be a direct, vertical movement so that thesaid fastening bar or strip may be made equal in length to thetransverse dimension of the box and will fit against the side walls ofthe same so as to prevent any leakage and render the use of additionalretaining strips unnecessary. lVhen it is desired to clean the screen itis necessary merely to rotate the nut or sleeve let to the leftwhereupon the bolts 10 will ride inward in the slots 9 and the inner ofsaid bolts will consequently force the fastening bar 8 upward so as todisengage the same for the screen plates, which will thereupon bereleased and may be readily removed for cleaning.

The invention presents an extremely simple construction, and itsadvantages are thought to be manifest.

The channel irons and the I-beams are made of galvanized sheet metal soas to possess the necessary strength without great weight. The screenbox, consequently, can be easily operatedL Having thus described myinvention, what I claim is 1. In a paper pulp screen, the combination ofscreen plates, a fastening bar engaging the adjacent edges of the screenplates, a transverse retaining bolt below the fastening bar and inengagement therewith, and

means for moving the said bolt longitudinally of the fastening barwhereby said bar will be moved vertically into or out of engagement withthe screen plates.

2. In a paper pulp screen, the combination of spaced transverse beams,screen plates resting thereon, a fastening bar fitted between the saidspaced transverse beams and having a dovetailed head adapted to engagethe edges of screen plates, a retaining bolt disposed transversely ofthe spaced beams and engaging the fastening bar, and means for movingthe said bolt longitudinally of the transverse beams whereb the saidfastening bar will be moved vertlcally between the said beams.

3. The combination with spaced trans verse beams, of screen platesresting thereon, a fastening bar inserted between the transverse beamsand adapted to engage the screen plates and provided on its under-sidewith an inclined notch, a bolt fitted transverselyin the beams andengaging the said inclined notch, and means mounted on the side of thescreen box for moving the said bolt longitudinally of the beams.

4:. The combination of spaced transverse beams having longitudinallydisposed slots, screen plates resting on the beams, a fastening baradapted to engage the screen plates and provided with a depending webfitting between the beams, transverse bolts mounted in the longitudinalslots in the beams, links connecting the said bolts, an eye-boltengaging the outermost of said transverse bolts, and a swiveled nut onthe outer end of said eye-bolt to impart a longitudinal movement to thesame.

5. The combination with spaced transverse beams, of screen platesresting thereon, a fastening bar adapted to engage said screen platesand provided with a depending web fitting between the transverse beams,a pair of bolts fitted transversely in the beams and arranged to movelongitudinally of the same, one of said bolts engaging the depending webof the fastening bar, a drivingbolt engaging one of said transversebolts, a nut or sleeve mounted on said driving bolt and provided with anexternal annular groove, a bearing plate supporting the said nut orsleeve, and a locking plate secured on said bearing plate and engagingthe said annular groove.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signature in the presence of two witnesses.

M. J. PO ER, HERMAN I-I. HELKE,

